With the fast track to commercialization of the fifth-generation (5G) communication networks, UAVs are playing an increasingly irreplaceable role in the field of 5G application scenarios [1]}. Thanks to their high mobility, low cost, and line-of-sight (LoS) transmission, the cross-border integration of UAVs and wireless communications can further improve communication coverage, throughput, and average
secrecy rates [2]}, [3]}, [4]}.
